The Evolution of Modern Humans in Africa by Pamela R. Willoughby download in ePub, pdf, iPad

This contrasts with archaic humans, where the brow ridge is pronounced and unbroken. The results, if correct, supports the multiregional origin of modern humans hypothesis. Unfortunately this consensus in principle hardly clarifies matters much in practice. Proponents of multiregional origin reject the assumption of an infertility barrier between ancient Eurasian and African populations of Homo. From that settlement, some others point to the possibility of several waves of expansion.

However, Linnaeus postulated four other extant subspecies, viz. These were found in in Omo National Park in south-western Ethiopia. This is when the majority of a species suddenly dies out, perhaps due to a sudden catastrophe, bringing it to the brink of extinction. Once a sperm merges with an egg, all the sperm mitochondria are destroyed. Instead, it changes the inherited means of growth and development that typify a population a group of individuals of the same species living in a particular habitat.

This suggests that modern humans evolved in Africa and then expanded out into Asia and Europe, where Neanderthals lived. The only widely recognized archaic subspecies is H. Further analysis showed that each pair of chromosomes was similar in sequence.

As they migrated they would have encountered earlier, primitive humans, eventually replacing them. The intermingling of the various populations eventually led to the single Homo sapiens species we see today.

In current humans, often only the central section of the ridge is preserved if it is preserved at all. This sort of event would have put immense pressure on humans.

Evidence of the coastal migration is hypothesized to have been destroyed by the rise in sea levels during the Holocene epoch. The human genome looks the way it does because of all the genetic changes that have affected our ancestors. As a result the scientists stated that modern humans could not have emerged in different places, but instead had to have come from one region, Africa.